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PDF 33993 Data sheet ( Hoja de datos )
| Número de pieza | 33993 | |
| Descripción | Multiple Switch Detection Interface | |
| Fabricantes | Freescale Semiconductor | |
| Logotipo |  |
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Freescale Semiconductor
Advance Information
Multiple Switch Detection
Interface
Document Number: MC33993
Rev. 4.0, 6/2007
33993
The 33993 Multiple Switch Detection Interface is designed to detect
the closing and opening of up to 22 switch contacts. The switch status,
either open or closed, is transferred to the microprocessor unit (MCU)
through a serial peripheral interface (SPI). The device also features a
22-to-1 analog multiplexer for reading inputs as analog. The analog
input signal is buffered and provided on the AMUX output pin for the
MCU to read.
MULTIPLE SWITCH
DETECTION INTERFACE
The 33993 device has two modes of operation, Sleep and Normal.
The Sleep mode provides low quiescent current and enables the
wake-up features of the device. Normal mode allows programming of
the device and supplies switch contacts with pull-up or pull-down
current as it monitors switch change of state.
The 33993 is packaged in the 32-pin wide-body SOIC, reducing
circuit board area. Low quiescent current makes the 33993 ideal for
automotive and industrial products requiring low sleep state currents.
Features
DW SUFFIX
EK SUFFIX (PB-FREE)
98ARH99137A
32-PIN SOICW
ORDERING INFORMATION
• Designed to Operate 5.5 V ≤ VPWR ≤ 26 V
• Switch Input Voltage Range -14 V to VPWR, 40 V Max
• Interfaces Directly to Microprocessor Using 3.3 V/5.0 V SPI
Protocol
• Selectable Wake-Up on Change of State
Device
MC33993DWB/R2
MCZ33993EW/R2
Temperature
Range (TA)
-40°C to 125°C
Package
32 SOICW
• Selectable Wetting Current (16 mA or 2.0 mA)
• 8 Programmable Inputs (Switches to Battery or Ground)
www.DataSheet4U.com • 14 Switch-to-Ground Inputs
• VPWR Standby Current 100 µA Typical, VDD Standby Current 20 µA Typical
• Active Interrupt (INT) on Change-of-Switch State
• Pb-Free Packaging Designated by Suffix Code EW
VBAT
VBAT
VBAT
33993
SP0
SP1
VPWR
SP7
SG0
SG1
VDD
WAKE
SI
SCLK
CS
SO
INT
AMUX
Power Supply
LVI
VDD
Enable
Watchdog
VDD Reset
MCU
MOSI
SCLK
CS
MISO
INT
AN0
SG12
SG13
GND
Figure 1. MC33993 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2003-2007. All rights reserved.
1 page  
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. Static Electrical Characteristics
Characteristics noted under conditions 3.1 V ≤ VDD ≤ 5.25 V, 8.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TC ≤ 125°C, unless otherwise
noted. Typical values noted reflect the approximate parameter means VPWR = 13 V, TA = 25°C under nominal conditions unless
otherwise noted.
Characteristic
Symbol Min Typ Max Unit
POWER INPUT
Supply Voltage
Supply Voltage Range Quasi-Functional (6)
Fully Operational
Supply Voltage Range Quasi-Functional (6)
V
VPWR(QF)
5.5
–
8.0
VPWR(FO)
8.0
–
26
VPWR(QF)
26
–
40
Supply Current
All Switches Open, Normal Mode, Tri-State Disabled
IPWR(ON)
–
mA
2.0 4.0
Sleep State Supply Current
Scan Timer = 64 ms, Switches Open
IPWR(SS)
40
µA
70 100
Logic Supply Voltage
Logic Supply Current
All Switches Open, Normal Mode
Sleep State Logic Supply Current
Scan Timer = 64 ms, Switches Open
VDD
IDD
IDD(SS)
3.1 – 5.25 V
mA
– 0.25 0.5
µA
– 10 20
SWITCH INPUT
Pulse Wetting Current Switch-to-Battery (Current Sink)
IPULSE 12 15 18 mA
Pulse Wetting Current Switch-to-Ground (Current Source)
IPULSE 12 16 18 mA
Sustain Current Switch-to-Battery Input (Current Sink)
ISUSTAIN
1.8
2.0
2.2
mA
Sustain Current Switch-to-Ground Input (Current Source)
ISUSTAIN
1.8
2.0
2.2
mA
Sustain Current Matching Between Channels on Switch-to-Ground
Inputs
IMATCH
%
ISUS(MAX) - ISUS(MIN) X 100
ISUS(MIN)
– 2.0 4.0
Input Offset Current when Selected as Analog
Input Offset Voltage when Selected as Analog
V(SP&SGINPUTS) to AMUX Output
Analog Operational Amplifier Output Voltage
Sink 250 µA
IOFFSET -2.0 1.4 2.0 µA
VOFFSET
mV
-10 2.5
10
VOL mV
– 10 30
Analog Operational Amplifier Output Voltage
Source 250 µA
VOH
V
VDD - 0.1
–
–
Switch Detection Threshold
VTH
3.70 4.0
4.3
V
Switch Input Voltage Range
Temperature Monitor (7), (8)
Temperature Monitor Hysteresis (8)
VIN -14 – 40 V
TLIM
155 – 185 °C
TLIM(HYS)
5.0
10
15
°C
Notes
6. Device operational. Table parameters may be out of specification.
7. Thermal shutdown of 16 mA pull-up and pull-down current sources only. 2.0 mA current source/sink and all other functions remain
active.
8. This parameter is guaranteed by design but is not production tested.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33993
5
5 Page 
FUNCTIONAL DEVICE OPERATION
FUNCTIONAL PIN DESCRIPTION
FUNCTIONAL DEVICE OPERATION
MCU INTERFACE DESCRIPTION
The 33993 device directly interfaces to a 3.3 V or 5.0 V
microcontroller unit (MCU). SPI serial clock frequencies up to
6.0 MHz may be used for programming and reading switch
input status (production tested at 4.16 MHz). Figure 7
illustrates the configuration between an MCU and one 33993.
Serial peripheral interface (SPI) data is sent to the 33993
device through the SI input pin. As data is being clocked into
the SI pin, status information is being clocked out of the
device by the SO output pin. The response to a SPI
command will always return the switch status, interrupt flag,
and thermal flag. Input switch states are latched into the SO
register on the falling edge of the chip select (CS) pin.
Twenty-four bits are required to complete a transfer of
information between the 33993 and the MCU.
MC68HCXX
Microcontroller
Shift Register
MOSI
MISO
33993
SI
24-Bit Shift Register
SO
Receive
Buffer
Parallel
Ports
SCLK
INT
CS
INT
To Logic
Figure 7. SPI Interface with Microprocessor
Two or more 33993 devices may be used in a module
system. Multiple ICs may be SPI-configured in parallel or
serial. Figures 8 and 9 show the configurations. When using
the serial configuration, 48-clock cycles are required to
transfer data in/out of the ICs.
MC68HCXX
Microcontroller
Shift Register
MOSI
MISO
SCLK
Parallel
Ports
INT
33993
SI
SO
SCLK
CS
INT
33993
SI
SO
SCLK
CS
INT
Figure 8. SPI Parallel Interface with Microprocessor
MC68HCXX
Microcontroller
Shift Register
MOSI
MISO
SCLK
Parallel
Ports
INT
33993
SI
SO
SCLK
CS
INT
33993
SI
SO
SCLK
CS
INT
Figure 9. SPI Serial Interface with Microprocessor
Analog Integrated Circuit Device Data
Freescale Semiconductor
33993
11
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| PDF Descargar | [ Datasheet 33993.PDF ] | |
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